TM 5-3805-293-23-2
0023
Table 1. Cab Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
13. One or Both Brake
Test Step 11. Check for Open Cir-
Lights Do Not Operate,
cuit in Cab Upper Wiring Harness.
Turn Signals Operate
1. Disconnect the cab upper wiring
Normally - Continued
harness connector R-C3 (WP
0009, Figure 91) from cab lower
wiring harness connector P-C42
(WP 0009, Figure 90) (WP 0265).
2. Connect jumper wire between LH
turn relay socket (WP 0009, Fig-
ure 329) terminals B5 and A5.
3. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
resistance between cab upper
Replace cab lower wiring harness
wiring harness connector R-C3
(WP 0266).
(WP 0009, Figure 91) terminal 6
Connect the LH turn relay (WP 0009,
and terminal 10. Resistance
Figure 326) to LH turn relay socket
should be less than 5.0 ohms.
(WP 0009, Figure 327).
Proceed to step 4.
Resistance 5.0 Ohms or Greater -
Replace cab upper wiring harness
(WP 0265).
Connect the LH turn relay (WP 0009,
Figure 326) to LH turn relay socket
(WP 0009, Figure 327).
Proceed to step 4.
4. Turn control indicator switch to
Right and Left Brake Lights Do Not
position SER. DRIVE, have an
Operate - Repeat troubleshooting
assistant apply the service brakes
from the beginning.
(TM 5-3805-293-10) and observe
Right and Left Brake Lights Oper-
the brake lights from the rear of
ate - Troubleshooting complete.
the machine and verify both brake
lights operate.
Test Step 12. Check for Faulty RH
Turn Relay.
1. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
2. Disconnect the RH turn relay (WP
0009, Figure 328) from RH turn
relay socket (WP 0009, Figure
327).
0023-75